Improvement in escapement for time-pieces



M. TRJMLY.

Glock Esoapement. 110.100,21?. Patented Feb. 22,1870.

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MICHAEL TRMLY, OF CINCINNATI, OHIO, ASSIGNCR T() HIMSELE AND W L. HASBROUCK, OF SAME PLACE.

Letters tatmt No. 100,217, dated February 22, 1870.

IMPROVEMENT IN ESCAPEMENT IOR TIME-PIECES.

The Schedule referred to In these Letters Patent and making part of the lame.

To all whom it may concern Be it known that I, MICHAEL TROMLY, of Cincinnati, in the county of Hamilton, and State of Ohio, have invented anew and useful Improvement in Clocks;

and I do hereby declare* that the following is a full,

clear, and exact description of the construction and operation of the same, reference being had to the accoxnpanying drawings making part of this specification, in which- My invention is represented by a front elevation of a clockwith the upper portion of the front pla-te removed so as to show the striking-wheel'and the lifter on the minute shaft, and a detached view of the escapement.

Ilhis invention consists in a new escapement, the same being made up of a single pallet provided with a wire arm connected at its free end with a cam groove on the hub of the balance-wheel, in such manner that at each vibration ofthe'latter the pallet is thrown out` to allow-one tooth to pass.

A is the striking-wheel, having' seventy-eight teeth, a, in its perimeter,- each tooth acting on vthe hammer a', so as to'produce a stroke upon the bell a".

On one side of the wheel A is a 'series of thirteen pins b, arranged near the rim in a circle, thel spaces between said pins representing an arithmetical progression of twelve terms witha constant difference of one.

Motion is communicated to the wheel A by a spring, b', coiled around its shaft in the usual manner.

The pins, in their orbit, come in contact successively with a stop, c, having a slot, c', in it for the pins to slip through on the lowering ofthe stop by theeccentric lit'ter c" on the minute shaft c at the moments for striking the hours.

On the passage of one of the pins through the slot c, the lifter having passed, the stop immediately resumes its former position so as to be ready to intercept the next pin, which strikes the stop in no longer time than isu'equired to strike the hour, and is in its turn let through when its hour arrives. The wheel A makes but two revolutions in twenty-four hours.

For striking the half hour, I attach another eccentric lifter to the minute shaft, which raises'a hammer and lets it fall upon the bell at one half past without being in connection with any other gearing'.

I construct the balance-wheel B of about thrice the usual diameter of balance-wheels, Abut of the same weight', in order to treble the momentum and proportionately diminish friction. By this arrangement I am enabled to run a balance-wheel clock with as little waste of power as a pendulum.

The escapement consists of a single pallet, d,'piv oted at d', and having an arm, d, extending from its rear andl lowerpart into the cam-groove d on the .shaft of the balance-wheel.

The hub of the balance-wheel bears a pin, x, which forms the other tooth of the escapement. Thus every vibration of the balance-wheel withdraws the detent from its cog-wheel and restores it, with unfailing accuracy, allowing| one tooth to escape meanwhile.

Having thus described my invention,

WhatI claim as new, and desire to secure by Let ters Patent, is-

The pallet d, combined with the arm d", pin a', and cam-groove d, as and for the purpose set forth..

MICHAEL TROMLY.

Witnesses CHAs. FAUST, WM. L; HAsBRoUoK. 

